- add new FASTOCTREE quantizer with alpha support
- make ZIP compress level and type configurable
- support reading/writing PNGs with paletted alpha
source 3637439d51
This gets the putdata test case to run correctly under 2.6/2.7. It fixes an
issue where the value 0xFFFFFFFF (which is long in old Python) isn't
recognized and putdata tries to parse it as a tuple.
The original fix comes from Christoph Gohlke. It was adapted to work in
both 2.* and 3.*.
This commit also renames some functions from "fromstring" and the like to
"frombytes". I'll probably need to come back later and update any
references to "string," here or in the docs.
I also noticed that encode allocates some data for certain codecs, but
never frees them. That would be a good bug to fix. I fixed the one where it
outright stole a pointer from Python.
This commit:
* Adds Python 3 module initialization functions. I split out the main init
of each module into a static setup_module function.
* Adds a py3.h which unifies int/long in Python 3 and unicode/bytes in
Python 2. _imagingft.c unfortunately looks a little kludgy after this
because it was already using PyUnicode functions, and I had to mix and
match there manually.
With this commit, the modules all build successfully under Python 3.
What this commit does NOT do is patch all of the uses of PyArg_ParseTuple
and Py_BuildValue, which all need to be checked for proper use of bytes
and unicode codes. It also does not let selftest.py run yet, because there
are probably hundreds of issues to fix in the Python code itself.
Python 3 enables C's strict aliasing rules for the first time, which means
you need to be careful about the ways you reference pointers. Here, we're
using a char[4] as an INT32, so we cast between them using a union.
Other ports have taken advantage of the fact that Python 3 has wrappers for
the old buffer protocol, but there's a significant disadvantage: you can't
let the buffered object know when you're done with it.
Since Python 2.6 supports the new protocol, we just go ahead and move to
it.
